Jeeze, this is a rough neighborhood!! Let me get in & then get out. Most 'O's grow in spurts. When the metabolism is at it's height, you'll have the fastest growth. As it slows, the growth rate will continue but at a slower pace. Max TL will vary from fish to fish. Some max 12" others a bit larger. Some increase more in girth, others don't. All in all, if you continue a 'quality' diet w/ sufficient space & optimum water maint. you'll have a very happy, healthy, large Oscar. "T"